Saint Ignatius sain·tig·na·tius uncommon noun 1. bishop of Antioch who was martyred under the Roman Emperor Trajan (died 110) SynonymsIgnatiusSaint IgnatiusSt. Ignatius Related words Word family Saint Ignatius' itchSaint Ignatius of Loyola Broader terms bishopsaint WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.